Leviathan
Leviathan by Thomas Hobbes (2009) was raised once of The Seen and the Unseen, in conversation with Subhashish Bhadra.
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Philosophy
Which episode raised this book?
Author, year and identifiers come from Google Books, matched by title. The title is as the show notes wrote it. The notes say which books an episode touched, not who raised each one, so the people named above were in the room rather than confirmed as the recommender. How this is built.